Malicious PDF — malware analysis report

Static analysis result for SHA-256 942584765ce3f840…

MALICIOUS

PDF

68.9 KB Created: 2021-03-22 19:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c319d877e6c3982209fc5f4ba86487d9 SHA-1: 19f0a9bac7e3e6e8d903b7025e989d6d7f932a67 SHA-256: 942584765ce3f840e4c982bfa63123408fbe2c7ffd0d5aca09f549962b00e048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous external links, with one prominent URL pointing to a domain associated with malicious activity. The document body, though heavily obfuscated, suggests a lure related to a product manual, which is a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=roper+whirlpool+fridge+manual
    • http://idem-peshkom.ru/jaretezesoz5mxy0.pdf
    • http://trenolgia.buzz/17844151685j5kqm.pdf
    • http://tamakar.tech/wintercroft_freeqslgw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_375fe57b3b28459096879c47006f2c85.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c63f83a0-ec94-411e-8931-823597c6fca3/2004_dodge_ram_1500_fuel_pump_pigtail.pdf
    • https://s3.amazonaws.com/jawusawar/weider_pro_4950_workout.pdf
    • https://uploads.strikinglycdn.com/files/10f37b50-af84-4dc6-b2b4-8f5a648ac542/34804734052.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_b7a605312c7542a8abe20995bf9625e7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/53a5f8ff-ff46-402e-a62e-aa92b8e01b3d/67908808028.pdf
    • https://s3.amazonaws.com/mexijegedakol/acer_aspire_e15_battery_reset_pinhole.pdf
    • https://uploads.strikinglycdn.com/files/1d635084-a447-4c65-bc16-5d26f26b7d64/26948625339.pdf
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_fead279d96a341c8be19c10609a731aa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/be5aba33-c9ba-4c21-9512-e884cbde3fb2/zagg_keyboard_ipad_air_not_working.pdf
    • https://uploads.strikinglycdn.com/files/5d98fcd8-c1f3-4e36-9fa9-e75fbbed0bd2/89896290613.pdf
    • https://a0e9597c-cfbb-4fc1-b0e0-47ed6411b148.filesusr.com/ugd/24269e_b045b569c0b743f89dcf6051b11b84d9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/24c335eb-b390-48aa-8da7-436866fa4d20/tireuse_a_biere_krups_beertender_b90.pdf
    • https://uploads.strikinglycdn.com/files/064de6fa-2476-42a6-9b44-040524782255/zuzonenufimov.pdf
    • https://uploads.strikinglycdn.com/files/fdfaa3f4-2c01-4d9a-9dd4-b697628fd6a5/baritone_uke_song_chords.pdf
    • https://uploads.strikinglycdn.com/files/3099b680-f026-4768-8cae-491925d8c0ac/kenmore_refrigerator_model_253_dimensions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd65.bin
877a52153fc2f1ebaaedd9122fd188f655b174dcbfc2e09c1a4e328d7c7bb50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 5376 bytes
font_01_sfnt_off0000df9e.bin
482bf341845bd0f38a8f036523277c0e9e22a98f33b3eb63f95f34c0ca478ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 11112 bytes

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